Everyone on ETS forum reminds us that a map and compass are primary for land (and air/sea too) navigation.
That being said, GPS's are amazing. With WAAS it's about 3 Meters horz. location. Most of us practice with map and compass to maintain our skills (always a good idea).
Now I have been land navigating for 30 years and been a pilot for 20 years. Even in my dreams try locating yourself to 1/8 or 1/4 of a mile by map and compass in sparse terrain. Yes in woodlands with lots of handrails, clearly defined features it's easy to find your position to 50 Meters. But under stress, in poor visibility, when your tired, etc. It's nice to have the option. Remember you can always turn it off when you want.
I personally carry at least two compasses at all times in the field, and at least one GPS. You never know.
GPS's are so cheap now, my first one was >$500 USD, and didn't have any mapping functions.